How is the empty weight CG determined after adding or removing equipment?

Determining the empty weight center of gravity (CG) after adding or removing equipment involves calculating the new weights and their respective arms. When equipment is added or removed, both the weight and the location of that weight (its arm) must be considered to accurately establish the new CG.

To perform this calculation, you would take the total moment contributions of all the weights (including the original empty weight and any added or removed items) and divide that by the total weight of the aircraft, including the changes. Each weight has a corresponding arm, which is the distance from a reference point (usually the nose or a specified datum). By summing the products of weights and their arms, you can find the total moment which is crucial for finding the new CG position.

This method ensures that the calculations factor in both the magnitude of the weight changes and their influence on the aircraft's balance, allowing for a precise determination of how the CG has shifted. This alignment of weight changes with their respective positions is essential for maintaining aircraft performance and safety in flight.